POL YPT YCHUS . 171 



spiracle ; horn green with reddish tubercles ; legs red ; spiracles 

 reddish. 5th instar. Similar to the 4th instar. The body now 

 increases in diameter from segment 2 to 7, then decreases 

 slightly to 12. The horn is held nearly horizontal. 



&h instar. Head rounded-triangular, the vertex rounded, 

 without processes ; clypeus small, triangular. Surface of 

 head somewhat shining, covered with small, rounded tubercles. 

 Bodj T stout for its length. Horn of medium length, stout at 

 base and tapering evenly to a blunt point, strongly down- 

 curvecl. Segment 2 of the body as broad as the head, and the 

 segments gradually increasing in diameter to about 7, then 

 very gradually decreasing to 12. Surface of body dull, covered 

 sparsely with small pointed tubercles, arranged somewhat 

 irregularly on the dorsum and along the secondary rings in the 

 lateral area ; a few tubercles on the bases of the prolegs ; 

 a subdorsal ]ine of larger tubercles from front margin of segment 

 2 to near base of horn, some of these tubercles with two 

 or three points, forming a serrate ridge. Horn tuberculate. 



Coloration. — Head bluish-green, the tubercles white ; labrum 

 shining, pale brown ; basal segment of antenna whitish, the 

 other segments blackish-brown with a white ring round each ; 

 mandible brown with the tip darker. Body yellowish-green 

 above the subdorsal line of tubercles, bluish-green below it ; 

 the smaller tubercles on the body violet with yellow tips ; 

 the subdorsal line of larger tubercles pink or purple ; whitish 

 or yellowish oblique stripes, clearly denned on 8 to 11, faint 

 on the anterior segments, that on 11 extending backwards 

 to base of horn ; in some larvae there are purple or brownish- 

 purple triangular patches between the upper part of each 

 oblique stripe and the subdorsal line of tubercles, and broader, 

 rounded patches above this line, the patches not reaching 

 dorsum. Horn yellowish-green with the tubercles yellow or 

 purplish ; true legs pink with yellow tubercles ; prolegs and 

 claspers bluish-green, with yellow or purplish tubercles, the 

 clasper with a violet-brown band at the distal edge. Spiracles 

 oval, flush, pale violet or reddish, the central slit white edged 

 with black. Length 100 mm. ; breadth 15 mm. 



Pupa. — Very closely resembles that of P. t. sonanthis, the 

 only notable differences being that in dentatus the dorsum of 

 segment 2 is more rugose, and these rugosities are black, and 

 the dorsal line of the same segment is generally raised into 

 a ridge. All other details as in P. t. sonanthis. 



Habits. — Eggs laid singly on the underside of a leaf of the 

 food-plant, which is usually Cordia obliqua Willd., but the larva 

 will also feed on Ehretia Isevis Roxb., both of the family 

 Boraginese. The larva eats the egg-shell and then rests without 

 eating for about two days, when it makes the first moult and 

 commences feeding on the leaves of the food-plant. This 



